COltX FERTILIZERS 155 



(3) 100 to 200 Ib. acid phosphate, 

 200 Ib. cotton-seed meal. 



(4) For very sandy soils, 



100 to 200 Ib. acid phosphate, 



100 Ib. nitrate of soda (or 200 Ib. cotton-seed meal), 



50 to 100 Ib. kainit. 



For land that has been enriched in nitrogen by the plowing 

 under of cowpeas or similar growth, it will usually suffice to 

 fertilize with 200 Ib. per acre of acid phosphate or of an ordi- 

 nary cotton guano. But even here, it will often be profitable to 

 add 50 or 100 Ib. of nitrate of soda when the plants are 2 to 4 feet 

 high. 



When corn is grown in rotation on fairly good loamy or clay 

 soil, it appears to be better policy in most cases to withhold potash 

 from the corn, which is often unresponsive to it, and to apply if 

 necessary an additional amount to the cotton crop grown in the 

 same rotation, thus getting the benefit of its specific effect in 

 restraining cotton rust on soils subject to this malady. 



145. Time to apply fertilizers. When ordinary amounts 

 of commercial fertilizer, say 200 to 400 pounds per acre, 

 have been used, most experiments have shown at least as 

 large yields from applying the whole before planting as 

 from applying a part before planting and a part during the 

 cultivation of the crop. This conclusion is summed up in 

 a quotation from Bulletin No. 74, Georgia Experiment 

 Station, by Redding : " The experiments conducted on 

 this station long since proved that . . . (inter-cultural 

 fertilization) is not profitable as a rule. On the other hand 

 it is often advisable to withhold a part of the fertilizer 

 for inter-cultural application, when the total amount to be 

 applied is large; for example, 500 to 1000 pounds per 



